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Quantum dots modified by macromolecular monomer, preparation method for quantum dots and application of quantum dots

A technology of macromolecular monomers and quantum dots, which is applied in the field of nano-fluorescent materials and preparation, to achieve the effects of high luminous efficiency, stable performance, and precise and adjustable particle size

Active Publication Date: 2015-02-25
江苏康纳思光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is an effective solution to modify quantum dots with macromonomers instead of small molecule ligands.

Method used

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  • Quantum dots modified by macromolecular monomer, preparation method for quantum dots and application of quantum dots
  • Quantum dots modified by macromolecular monomer, preparation method for quantum dots and application of quantum dots
  • Quantum dots modified by macromolecular monomer, preparation method for quantum dots and application of quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Preparation of catalytic chain transfer agent CoBF

[0042] Add 3g of cobalt acetate and 2.5g of diacetyl to 250mL of diethyl ether pre-gassed with nitrogen for 2 hours to prepare a suspension, then add 15mL of boron trifluoride ether solution as a catalyst, and stir the reaction at room temperature to obtain a brown precipitate. The precipitate was filtered, washed with ice water, and dried at room temperature. The dried brown solid was recrystallized twice in methanol and dried to obtain CoBF as a brown powder.

[0043] 2. Preparation of PMAA macromolecular ligands with double bonds at the end by catalytic chain transfer polymerization

[0044] Methacrylic acid and distilled water were pretreated to remove free oxygen from the solution. 0.3g of initiator VA-044 and 10mg of catalyst CoBF were dissolved in 2mL of acetone, then added to a three-necked flask filled with 150mL of distilled water, 5mg of catalyst was dissolved in 74g of MAA and placed in a constant pre...

Embodiment 2

[0050] 1. Preparation of catalytic chain transfer agent CoBF

[0051] The preparation process of the catalytic chain transfer agent CoBF in this example is the same as that in Example 2.

[0052] 2. Preparation of PMAA macromolecular ligands with double bonds at the end by catalytic chain transfer polymerization

[0053] Methacrylic acid and distilled water were pretreated to remove free oxygen from the solution. 0.4g of initiator VA-044 and 10mg of catalyst CoBF were dissolved in 2mL of acetone, then added to a three-necked flask filled with 150mL of distilled water, 5mg of catalyst was dissolved in 74g of MAA and placed in a constant pressure funnel, then vacuumed and passed into High-purity nitrogen, repeated six times to remove oxygen in the device, sealed. When the temperature of the water bath was constant at 55°C, the MAA monomer was added dropwise, and after the MAA was added dropwise, the reaction was carried out for 1 h. The reaction product was placed in a watch ...

Embodiment 3

[0059] 1. Preparation of catalytic chain transfer agent CoBF

[0060] The preparation process of the catalytic chain transfer agent CoBF in this example is the same as that in Example 2.

[0061] 2. Preparation of PMAA macromolecular ligands with double bonds at the end by catalytic chain transfer polymerization

[0062] Methacrylic acid and distilled water were pretreated to remove free oxygen from the solution. 0.3g of initiator VA-044 and 10mg of catalyst CoBF were dissolved in 2mL of acetone, then added to a three-necked flask filled with 150mL of distilled water, 5mg of catalyst was dissolved in 74g of MAA and placed in a constant pressure funnel, then vacuumed and passed into High-purity nitrogen, repeated six times to remove oxygen in the device, sealed. When the temperature of the water bath was constant at 65°C, the MAA monomer was added dropwise. After the MAA was added dropwise, the reaction was carried out for 1 h. The reaction product was placed in a watch glas...

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Abstract

The invention discloses quantum dots modified by a macromolecular monomer. According to the quantum dots, the macromolecular monomer which is prepared through catalytic chain transfer polymerization is taken as a ligand; and the quantum dots have the characteristics of narrower fluorescence emission spectrum, high luminous efficiency and high stability. Particle sizes of the quantum dots modified by the macromolecular monomer are 2 to 20nm, the quantum dots are water-soluble, the quantum yield is 20 to 95 percent, the half-peak width of a photoluminescence spectrum is 20 to 80nm, and the fluorescent quantum dots are one of ZnxCd1-xS, ZnxCd1-xTe and ZnxCd1-xSe, wherein x is more than or equal to 0 and less than or equal to 1; and the macromolecular monomer used as the ligand is one of polymethylacrylic acid, polyacrylic acid, poly(hydroxyethyl methacrylate), poly(2-Hydroxypropyl methacrylate) or a polymethylacrylic acid-b-poly(butyl acrylate) block copolymer, and the molar ratio of the macromolecular monomer to metal ions is (0.5:1)-(5:1).

Description

technical field [0001] The invention relates to a nano fluorescent material, a preparation method and an application thereof, in particular to a quantum dot modified by a macromolecular monomer, a preparation method and an application thereof. Background technique [0002] Quantum dots (QDs), also known as semiconductor nanocrystals (nanocrystals, NCs), have a diameter between 1 and 12 nm, and are usually a semiconductor nanocrystal composed of II-VI or III-V elements. particles. Due to its small average particle size, many surface atoms, large specific surface area, and high surface energy, quantum dots have some special physical effects, such as small size effect, surface effect, quantum size effect, macroscopic quantum tunneling effect, etc., and exhibit Excellent optical and electrical properties. Quantum dots have broad application prospects in the fields of optoelectronic devices, solar cells, sensors and biomarkers, so they are favored by many scientific researchers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/06C08F293/00C08F220/18C08F2/38C08F8/42C09K11/88C09K11/56H01L33/50
Inventor 陈苏朱琳周进高德康王文洪
Owner 江苏康纳思光电科技有限公司
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